exercise for aerobic training, circuit training, and conditioning has
traditionally used heart rates to quantify the intensity based on premeditated
structured training zones. Two common methods to identify the heart rate
training zones include the Max Heart rate Formula and the Karvonen or Heart
Rate Reserve Method. Of the two, the heart rate formula is most widely used and
recognized. The formula simply uses a prediction of heart rate max (220-age)
and defined percentages (75-90% HRmax) of that value to determine the training
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